SoundMax SM-CMD3004 - Manual (Page 6)

6
Electrical connections
Speaker Wiring Notes
Follow the above wiring diagram to install the head unit with new or existing speakers.
This unit is designed for use with four (4) speakers with an impedance 4 Ohms.
An impedance load of less than 4 Ohms could damage the unit.
Never bridge or combine the speaker wire outputs. When not using four speakers, use electrical tape to tape
the ends of the unused speaker outputs to prevent a short circuit.
Never ground the negative speaker terminals to chassis ground.
For your driving safety, please link your parking wire with low power level, and keep it controlled by manual
brake switch. Wire should be high power level and the unit cannot play video disc.